In Nursing Field, we might want to know the mean diffrences between two or more groups when we want to compare the effect of two treatment or we want to test a drug.
Suppose we want to test the effect of a drug which will help to loose weight, Then we divide our sample into 2 groups, One group , Group 1 is given drug and other group, Group 2 doen not given any drug but otherwise everything like diet and amount of exercise is same. After a period of time weight loss by both the groups are measured. Then we find the differences between both the weight loss and see if their is any diffrence or not . That is whether the drug is effective or not.
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